Sponsor(s)/Grant Number(s)
- \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.22]{tropfa.eps} \end{wrapfigure} The microwave spectrum was measured for the tropolone-formic acid doubly hydrogen bonded dimer using a pulsed-beam Fourier transform microwave spectrometer in order to search for the concerted double proton tunneling motion. The tunneling motion was expected for the dimer, as the transition state of this motion exhibits C$_2$$_V$ symmetry, which has been thought to be a requirement to observe the concerted double proton tunneling. The tunneling motion was not observed for this dimer, as the transitions measured did not show observable splittings into doublets. The barrier height calculated of the dimer using B3LYP/aug-cc-pVTZ was about 15000 cm$^-$$^1$, significantly larger than the value determined for the propiolic acid-formic acid dimer (3800 cm$^-$$^1$),$^a$ which showed the tunneling motion. The estimated separation of the minima in the potential energy surface is estimated to be very similar to that of propiolic acid-formic acid (about 0.8 \AA),$^a$ so the large barrier height may be why the tunneling process was not observed. \linebreak \\ $^a$Daly, A. M.
- \begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.26]{malfa.eps} \end{wrapfigure} The microwave spectra were measured for the maleimide monomer and the maleimide-formic acid doubly hydrogen bonded dimer using a pulsed-beam Fourier transform microwave spectrometer. Many previously studied doubly hydrogen bonded dimers are formed between oxygen containing species, so it is important to also characterize and study other dimers containing nitrogen, as hydrogen bonding interactions with nitrogen are found in biological systems such as in DNA. The transition state of the dimer does not exhibit C$_2$$_V$ symmetry, so the tunneling motion was not expected to be observed based on the symmetry, but it would be very important to also observe the tunneling process for an asymmetric dimer. Single-line b-type transitions were observed, so the tunneling motion was not observed in our microwave spectra. The hydrogen bond lengths were determined using a nonlinear least squares fitting program. \linebreak \\ Supported by the NSF CHE-1057796
- Boeing/C8088
- Bureau of Mines 81/06 J 0100011 81/06
- Bureau of Naval Weapons, Contract Now 64-0178-d
- Bureau of Ordnance, Department of the Navy, Contract No. N Ord-16417
- Bureau of public roads Department of Commerce Contract No. CPR-11-4204
- Bureau of Ships 57/10; Welding Research Council Pressure Vessel Research Comm 57/10
- Bureau of Ships, Department of Navy, Contract No. NOBS 72069
- Bureau of Ships, Department of Navy, Contract No. NOBS 72143
- Bureau of Ships, Department of the Navy, Contract N0bs 94232, Project Serial No. SF 020-01-05; Task 729-0
- Bureau of Ships - Department of the Navy Contract NObs 88283 Proj ect SR-149 Ship Structure Committee
- Bureau of Ships Fundamental Hydromechanics Research Program, S-R009 01 01, David Taylor Model Basin, Contract Nonr-1834 (32)
- Bureau of Ships; NOBS 72069; NOBS 86112; Welding Research Council, Pressure Vessel Research Committee
- Bureau of Ships, U.S. Navy. Contract NObs 65790, Index No. S-R 0090301 Task 1991
- C-2000
- CAFWS-141F
- Campus Research Board of the University of Illinois at Urbana-Champaign RB21012
- Campus Research Board, University of Illinois at Urbana-Champaign / RB15010
- Carle Foundation 95/01
- Carnegie 1040271-147720
- Carnegie Foundation for the Advancement of Teaching, National Science Foundation Grant SES-0138309
- Caterpillar Tractor Co 68/11; La Salle Steel Co 68/11; United States Steel Corp 68/11
- Caterpillar Tractor Company, Contract No. 44-22-60-311, 71/09
- Caterpillar Tractor Company, Peoria, IL, 73/
- CCF-0448501
- CCF 09-05584
- CCF-0905584
- CCF-0916893
- Center for Composite Materials Research Grant ONR N00014-86-K-0799
- Center is supported by the National Institute of Education. US-NIE-C-400-76-0116
- Center of Advanced Materials for the Purification of Water with Systems, a National Science Foundation Science and Technology Center, under Award CTS-0120978
- Centers for Disease Control and Prevention (Cooperative Agreement #U01 CK000505)
- Centre Hospitalier Universitaire Vaudois (MC/2014/002)
- Changed Richard C. to Richard Chase to match other item deposits. Metadata cleaned/updated by kappleg@illinois.edu 2015-5-13.
- Chicago Wilderness Grant/Contract No: AG ICF FS0505 (A5577, 492490)
- China Scholarship Council/2011602110
- CMS 95-22661
- CMS 95-22661; LG-3057
- CMS 98-12820; INT 95-11686
- CNS-0720512
- CNS 08-34709
- CNS 09-64081
- CNS 10-12194
- CNS-1035736
- CNS-1219064
- CNS-1302563
- CNS-1302563; CNS-1219064; ONR N00014-12-1-0046; Lockheed Martin 2009-00524; Rockwell Collins RPS#645038
- Committee 15, American Railway Engineering Association
- Conducted under grants MH 32884 and MH 33408 from the National Institute of Mental Health to the first author, and National Institute of Education contract HEW-NIE-C-400-76-0116 to the Center for the Study of Reading